Someone will be easier to go laugh when seeing another person laugh, than by contributing to cry when I saw other people sad. Why is that? Because laughter is spontaneous but need a reason to cry.

Various expressions can be given someone like laughing, crying, sad or angry. Recent studies have shown that a person is born to laugh because laughter is instinctive even when born baby would cry.

Researchers found it very natural to laugh without a reason to do so. Meanwhile, people need a reason to cry that is usually learned through experience or need a learning process.

Expression laugh when tickled or laughing at a joke by researchers to be instinctive. But other emotional vocalizations such as crying can not be spontaneous.

Dutch researchers involved 16 volunteers with half suffering from hearing loss to make the voices of various emotions such as sadness, terror, anger, joy, relief and other emotions without using words.

Then the interpretation of this emotion played in front of 25 people who all had normal hearing. Apparently aware that only a laugh and a sigh that could be identified from those who have hearing loss.

Meanwhile, other sounds such as cries of terror and sobs of grief will be easier to guess when done by people who do not have hearing problems.

These results indicate that laughter is something that is already known to the people since he was born, while others require learning such emotion from the sound issued.

"This means that for some types of emotional voices, heard the voice of others is one important part of developing ourselves to be able to understand people," said Disa Sauter researchers from the Max Planck Institute for Psycholinguistics in Nijmegen, as quoted from Dailymail.

Sauter said that even primates such as orangutans or gorillas would laugh if her body tickled. This means that the expression of emotions laughing and smiling does not need to be studied but it has happened by instinct or experience.

Professor Sophie Scott, a biological expert speaking from London's Institute of Neuroscience said the findings show that laughter is one of the different ways of breathing, and not the other way of speaking.